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Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Number of Weighted Average Shares The number of weighted average shares used in the calculation of basic earnings per share and diluted earnings per share was as follows for the years ended December 31:
202020192018
(In thousands)
Weighted average shares:
Basic shares229,435 227,759 230,823 
Equity-based compensation plans1,715 1,636 1,889 
Diluted shares231,150 229,395 232,712